ISO 25111:2009 智能运输系统 地面移动通信访问（CALM） 使用公共网络的一般要求

标准编号：ISO 25111:2009

中文名称：智能运输系统 地面移动通信访问（CALM） 使用公共网络的一般要求

英文名称：Intelligent transport systems — Communications access for land mobiles (CALM) — General requirements for using public networks

发布日期：2009-11

标准范围

ISO 25111:2009规定了通过公共无线网络（包括蜂窝电话和移动无线宽带（MWB）系统）使用CALM架构和协议提供服务的一般要求。特别是，ISO 25111:2009规定了公共无线网络应包括的协议和参数，以支持其环境中的长时间通信链路，其中异构切换或媒体独立切换（MIH）是维持链路所必需的，或由媒体选择策略确定的所需，且此类切换由公共无线网络提供。ISO 25111:2009的重点不是通过公共无线网络使用CALM的要求，其中没有提供异构小区/小区切换（即所谓的漫游服务），但也提供了在单个小区范围内使用此类系统的一般要求。在可行的情况下，ISO 25111:2009是通过参考合适的现有标准制定的，通过选择采用。提供了所需的区域差异。具体而言，对于ISO 25111:2009，公共无线网络的现有国家和国际标准以引用方式采用，在此不重新定义。ISO 25111:2009中不包括特定于应用程序的上层，但将由应用程序标准（可能不是特定于技术）驱动。

ISO 25111:2009 specifies general requirements for the provision of ITS services, using the CALM architecture and protocols, via the use of public wireless networks [including cellular telephony and mobile wireless broadband (MWB) systems].In particular, ISO 25111:2009 specifies protocols and parameters that public wireless networks shall include to support prolonged communication links in ITS environments where heterogeneous handovers or media independent handovers (MIH) are either necessary to maintain the link, or desirable as determined by media selection policies, and such handover is provided by the public wireless network.The requirements for the use of CALM via public wireless networks where there is no provision for heterogeneous cell/cell handover (i.e. so-called nomadic services) is not the central focus of ISO 25111:2009, but general requirements to enable the use of such systems, within the limits of the range of a single cell, are also provided.Wherever practicable, ISO 25111:2009 has been developed by reference to suitable extant standards, adopted by selection. Required regional variations are provided.Specifically, for ISO 25111:2009, extant national and International Standards for public wireless networks are adopted by reference and are not redefined herein.Application-specific upper layers are not included in ISO 25111:2009, but will be driven by application standards (which might not be technology specific).

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